Knowledge Base
Learn the Systems
Plain-language diagnostic guides and how-tos on diesel and automotive systems — written by the techs who fix them every day.
Fuel & Air
Turbo Trouble: Overboost vs. Underboost
Boost that's too high and boost that's too low can share causes — sticking vanes, leaks, bad sensors. Here's how to tell them apart and where to look.
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Fuel & Air
CP4 vs. CP3: The Fuel Pump Failure Diesel Owners Worry About
The Bosch CP4 pump powers many modern diesels — and when it fails it can take the whole fuel system with it. Here's why, and how owners protect against it.
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